In a large section of a statistics class, the points for the final exam are norm

Question

In a large section of a statistics class, the points for the final exam are normally distributed, with a mean of 71 and a standard deviation of 8. Grades are assigned such that the top 10% receive A's the next 20% received B s, the middle 40% receive C's the next 20% receive ,s, and the bottom 10% receive F. Find te la ost on the final exam that would qualify a student for an A, a B, a C, and a D 1 of the Standard Normal Table Click here to view Page 2 of the Standard Normal The lowest score that would qualify a student for an A is Round up to the nearest integer as needed.)

Explanation / Answer

top 10 % receive A
lowest score =
P(X > x) = 0.10
PZ> z) = 0.10
z = 1.282
Z = mean + z * sd
= 71 + 1.282 * 8 = 81.256

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